I did the same. Faced a problem where mp3 and opus replaygain tags follow different spec (replaygain calculators for some reason use R128_ tags for opus files for some reason) and some players don't support it yet. Apart from that there haven't been issues.
As someone who grew up with mp3 and is currently replacing it with opus, o7
(IK theres flac, but bruh…storage is expensive and my equipment isn't like state of the art)
I did the same. Faced a problem where mp3 and opus replaygain tags follow different spec (replaygain calculators for some reason use R128_ tags for opus files for some reason) and some players don't support it yet. Apart from that there haven't been issues.